High rate seed sensor

Details High rate seed sensor High rate seed sensor

1983-02-22

1985-11-26

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

221 2, 250206, 2502222, H03K 2104, G01D 2100

Patent

active

045556245

ABSTRACT:
A circuit is provided for a seed sensor which includes a light source and a light responsive element respectively positioned along a path of travel of seeds for producing a momentary change in signal level from the light responsive element in response to a momentary change of level of light incident thereupon from the light source due to the passage of one or more seeds therebetween. In accordance with the invention, the circuit comprises a pulse-producing circuit responsive to the change in signal level from the light responsive element for producing a discrete pulse signal in response to each change in the direction of the change in signal level. Predetermined ones of the discrete pulse signals are selected for counting.

REFERENCES:
patent: 3537091 (1970-10-01), Schenkenberg
patent: 3618819 (1971-11-01), Blackburn
patent: 3928751 (1975-12-01), Fathauer
patent: 4038982 (1977-08-01), Burke et al.
patent: 4157468 (1979-06-01), Primiano
patent: 4163507 (1979-08-01), Bell
patent: 4307390 (1981-12-01), Steffen et al.

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